mcp2515驱动的实现

1、1、在配置Linux编译选项时，开启相应的SPI选项，如下所示- Device Drivers- SPI supportSPI support* SPI Master Controller Drivers *-*- Bitbanging SPI master Samsung S3C24XX series SPI Samsung S3C24XX series SPI by GPIO* SPI Protocol Masters * SPI EEPROMs from most vendors User mode SPI device driver support Infineon TLE62X0 (

2、for power switching)设置完成保存。驱动文件 mcp251x.c mcp251x.h can.h文件 mcp251x.c 放在目录 drivers/net/can/下；文件 mcp251x.h 放在目录 include/linux/can/platform/下；文件 can.h 放在目 录 include/linux/can/下添加配置文件 drivers/net/can/Kconfig在文件中添加config CAN_MCP251Xtristate Microchip 251x series SPI CAN Controllerdepends on CAN & SPIdef

3、ault N-help-Say Y here if you want support for the Microchip 251x series of SPI based CAN controllers.在drivers/net/can/Makefile文件中添加编译文件 obj-$(CONFIG_CAN_MCP251X) += mcp251x.o修改文件 arch/arm/mach-s3c2410/mach-smdk2410.c 中添加 spi 板级启动信息#include #include 包含 s3c2410_spi_info 结构体#include 包含 struct mcp251x_

4、platform_data 结构体static struct mcp251x_platform_data mcp251x_info = .f_osc = 16000000,/.oscillator_frequency = 19000000,/.board_specific_setup = myboard_mcp251x_initfunc,/.device_reset = myboard_mcp251x_reset,/.transceiver_enable = NULL,;static struct spi_board_info spi_board_info _initdata = 0 =.mo

5、dalias = mcp251x, 这个名称一定要与 mcp251x.c 驱动中/proc函数中的.name要一致.platform_data=&mcp251x_info, 上面的结构体.irq=IRQ_EINT3,中断端口号.max_speed_hz=8000000,/spi最大的速度.bus_num=0,/spi0， 1 中选择 spi0 口.chip_select=0,多个芯片选择, ;static struct s3c2410_spi_info s3c2410_spi0_platdata = .pin_cs = S3C2410_GPG2,片选端口指定.num_cs = 1,总共端口数/

6、 .bus_num = 0,;smdk2410_devices 数组中添加&s3c_device_spi0，smdk2410_init函数中添加s3c_device_spi0.dev.platform_data= &s3c2410_spi0_platdata;spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info);4.重新编译内核boot LoaaerParameterLinux-2.6.25 KernelRootfs Cramfsuserfs Yaffs启动信息中有如下内容，说明成功了： wxuuHtitititi

7、ti-uxtitiwjawtiti 0 x00038000-0 x0004-0000 9x09649999-9x06499999 0X00400000-0X03200000 0X03200000-0X04000000mcp251x spiG.Ei： device register at dev【252:Ei)usbmon: debugfs is not availableS3c2+I0-Ohci S3c2+10-Ohci: S3C24XX OHCIs3c2+10-ohci s3c2+10-ohci： new USB bus registered, assigned bus number 1s3c2+10-ohci s3c2+10-ohci： irq 42, io mem 0 x49000000usb usbl： configuration #1 chosen from 1 choice5 执行命令 cat /proc/devices显示 252 mcp251x添加设备文件 mknod /dev/mcp251x c 252 0执行应用程序./can_test显示如下root(aFS2410/#mknod /dev/mcp251x c 252 0 rootFS241B/#cd /home/fengwei/drive/spi/ root(3FS2410spi#. /can_te